Variable reluctance type resolver

Abstract

Among eight teeth pairs, one teeth pair is a non-use teeth pair around which an exciting coil is not wound, and other seven teeth pairs are use teeth pairs around which the exciting coil is wound zero or more times. The number Wa of windings of the exciting coil wound around the tooth included in the use teeth pair in a 90° positional relationship with respect to the non-use teeth pair and the number Wb of windings of the exciting coil wound around the tooth included in the use teeth pair in a positional relationship other than the 90° positional relationship with respect to the non-use teeth pair satisfy a relationship of 0≤Wa≤0.5Wb. The number Wa of windings and the number Wb of windings may satisfy a relationship of 0<Wa≤0.5Wb.

The invention claimed is: 
     
       1. A variable reluctance type resolver provided in a motor in which a number M of magnetic poles of a motor rotor satisfies a relationship of M=2m, m being an even number, and having a multiplication factor of angle of two, the variable reluctance type resolver comprising:
 a rotor mounted coaxially with a motor shaft; 
 a stator having sixteen teeth; and 
 an exciting coil, a first output coil, and a second output coil selectively wound around the sixteen teeth, wherein 
 the sixteen teeth include eight teeth pairs, 
 each of the teeth pairs includes two teeth in a point symmetric positional relationship with respect to an axial core of the rotor, 
 among the eight teeth pairs, one teeth pair is a non-use teeth pair around which the exciting coil is not wound, and other seven teeth pairs are use teeth pairs around which the exciting coil is wound, 
 the exciting coil is wound in directions opposite to each other around the two teeth included in the use teeth pair so as to generate different magnetic poles, 
 the exciting coil is wound in directions opposite to each other around two teeth adjacent to each other along a circumferential direction of the axial core, among the teeth included in the use teeth pairs, and 
 a number Wa of windings of the exciting coil wound around the tooth included in the use teeth pair in a 90° positional relationship with respect to the non-use teeth pair and a number Wb of windings of the exciting coil wound around the tooth included in the use teeth pair in a positional relationship other than the 90° positional relationship with respect to the non-use teeth pair satisfy a relationship of 0<Wa≤0.5Wb. 
 
     
     
       2. The variable reluctance type resolver according to  claim 1 , wherein
 among the seven use teeth pairs, five use teeth pairs are first use teeth pairs around which the first output coil is wound, and other two use teeth pairs are second use teeth pairs around which the second output coil is wound, 
 the first output coil is wound in directions opposite to each other around the two teeth included in the first use teeth pair, and 
 the second output coil is wound in directions opposite to each other around the two teeth included in the second use teeth pair. 
 
     
     
       3. The variable reluctance type resolver according to  claim 2 , wherein
 the rotor is arranged inside the stator. 
 
     
     
       4. The variable reluctance type resolver according to  claim 1 , wherein
 the rotor is arranged inside the stator.